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172 435 94 07-01
ELECTRIC EQUIPMENT
2(2)
List of components LFL1... (BG550/BG550LN/BG650) Modulating with R316
A1 Gas burner control S7 Main switch 3-phase
A3 Valve, leak tester, S8 Air pressure switch
Dungs VPS 504 S10 Gas pressure switch, max.
A6 Power control R316 S11 Change-over switch, Aut.-man.
A6(2) PT 100-sensor, Thermocouple, S12 Change-over switch, Increase-
current/voltage Reduce
B1 Ionization electrode S20 Main switch 1-phase
F1 Operation fuse T1 Ignition transformer
F2 Operation fuse X1 Connection terminal board
F3 Operation fuse X2 Earth terminal
F4 Operating fuse 1A X3 Plug-in contact, burner
H1 Operating lamp X4 Plug-in contact, boiler
H2 Lamp, high capacity X7 Plug-in contact, 3-phase,
(optional) burner
K1 Motor contactor with thermal X8 Plug-in contact, 3-phase,
overload protector boiler
K2 Auxiliary relay X9 Plug-in contact, power
M1 Burner motor controller R316, burner
M2 Damper motor, X10 Plug-in contact, power
L&S SQN75.664.A21B controller R316
S1 Operating switch S9 Gas pressure switch
S3 Control thermostat Y1 Gas solenoid valve 1
S4 Temperature limiter Y3 Safety solenoid valve
S5 Micro switch for hinged door
Mains connection and fuse in accordance with local regulations.
Function LFL1...
1.Operating switch ON-Thermostat ON-Gas pressure switch ON-Air
damper closed.
A control is made that the air pressure switch does not indicate fan pressure.
Then the burner motor starts.
2.Air damper motor opens.
The air damper motor opens the damper to max. position. A control is made
that the air pressure switch indicates sufficient fan pressure.
3.Air damper motor closes.
The air damper motor closes to min. load position. Then the ignition spark
is formed.
4.Main and safety valves open
The gas is ignited. The ionization electrode indicates a flame.
5.The safety time expires.
The ignition spark goes out. The safety time expires. If there is no flame or
if for some reason the flame disappears after this time limit, the burner control
locks out.
6.Operating position.
The burner is in operating position and can now change over to the capacity
controlled by the regulator.
7.Stop.
The operation of the burner can now be interrupted by means of the operating
switch or the thermostat.
The control locks out. The red lamp in the control is lit. Restart the burner by pressing the reset
button.
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